Method and apparatus for measuring the vertical separation of two stations in a borehole

摘要

A system and method for use in a downhole tool having a fluid density measurement device positioned therein are provided. In one example, the method includes deploying the downhole tool at a first station in a borehole. The downhole tool is moved from the first station to a second station in the borehole. A plurality of fluid density values of fluid within the borehole between the first and second stations are measured using the fluid density measurement device in the downhole tool. The plurality of fluid density values may represent a continuous log of fluid densities between the first and second stations.

主权项

1. A method for obtaining fluid density values for a fluid between first and second stations in a borehole comprising:
deploying a downhole tool at the first station; moving the downhole tool from the first station to the second station; measuring a plurality of fluid density values of the fluid within the borehole between the first and second stations using a fluid density measurement device in the downhole tool, wherein the plurality of fluid density values represent a continuous log of fluid densities between the first and second stations; obtaining first and second fluid pressure values of the first and second stations, respectively; calculating a gravity value based on a depth of the first and second stations; calculating a vertical distance between the first and second stations based on the first and second fluid pressure values, the calculated gravity value, and the plurality of fluid density values; and calculating an average fluid density for the fluid between the first and second stations using the plurality of fluid density values, if the vertical distance between the first and second stations indicates that the fluid is non-homogenous.